Rising waters began to inundate the southern region late on Monday after days of heavy downpours, leaving eight dead in Songkhla province, two in Pattani and one each in Satun and Surat Thani provinces.
Thousands of soldiers have been dispatched to the area to help people stranded in their homes after flash floods swept through Hat Yai, a city of more than 150,000 people.
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A further three people were also killed in northern areas, where the flooding began on October 10, bringing the nationwide toll to 122, the Department of Disaster Prevention and Mitigation said.
So far more than six million people have been affected, with homes submerged and farmland or cattle destroyed, in what Prime Minister Abhisit Vejjajiva has described as "a huge natural calamity".
Waters have receded in most parts of Hat Yai, a city popular with tourists from Singapore and Malaysia.
But more than 100 foreign visitors remained stranded in their hotels early on Thursday, according to the Tourism Authority of Thailand.
The government has sent two naval ships to the southern region to provide medical and logistical support for the relief operation.
Thailand Floods Kill 122
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